CN110106860B - Method for repairing heavy metal polluted soil foundation and treating drainage consolidation - Google Patents
Method for repairing heavy metal polluted soil foundation and treating drainage consolidation Download PDFInfo
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- CN110106860B CN110106860B CN201910266430.0A CN201910266430A CN110106860B CN 110106860 B CN110106860 B CN 110106860B CN 201910266430 A CN201910266430 A CN 201910266430A CN 110106860 B CN110106860 B CN 110106860B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processing Of Solid Wastes (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for repairing heavy metal polluted soil foundation and treating drainage consolidation, which comprises the following steps: (1) setting a working layer; (2) laying a sand cushion layer on the operation layer; (3) arranging a drainage plate; (4) the plate heads of the drainage plates are connected with the joint sleeves and then connected to the horizontal drainage pipes, and each two rows of drainage plates are provided with one horizontal drainage pipe; (5) heavy metal passivation agent is arranged in the container, and then the container is connected with a horizontal drain pipe; (6) releasing chemical agents to passivate heavy metals of the polluted soil foundation; (7) pulling out the horizontal drainage pipe and connecting the horizontal drainage pipe to a vacuum pump; (8) and laying a sealing film, starting a vacuum pump, and reinforcing the foundation. The invention can combine the two processes of polluted soil treatment and foundation reinforcement, not only can reduce the treatment cost, shorten the construction time, improve the construction efficiency, effectively solve the treatment problem of the polluted soil, and has wide market prospect.
Description
Technical Field
The invention relates to the technical field of soil restoration and foundation treatment, in particular to a method for in-situ passivation restoration and drainage consolidation soft foundation treatment of heavy metal contaminated soil.
Background
For a long time, the problem of heavy metal pollution of soil is increasingly prominent due to extensive economic development modes in China and rapid development of industrial and agricultural production. The soil environment condition form of China is severe, the total point exceeding rate of the national soil is 16.1%, the number of the inorganic pollutant exceeding points accounts for 82.8% of all the exceeding points, the inorganic pollutants are mainly heavy metal pollutants, and the soil heavy metal pollution not only damages the ecological environment and reduces the crop yield, but also seriously harms the health of human bodies.
In-situ passivation repair is a repair measure which is most applied to soil heavy metal treatment at present, and is mainly characterized in that a passivation repair agent such as active substances is added into heavy metal contaminated soil, and a series of physical and chemical reactions such as adsorption, precipitation, complexation, ion exchange, oxidation reduction and the like are carried out to adjust and change the physical and chemical properties and occurrence forms of heavy metals in the soil and reduce the mobility, biological effectiveness and toxicity of the heavy metals in the soil, so that the stress of the heavy metals on soil organisms and the migration and accumulation of the heavy metals in the soil are reduced, and the purposes of safe utilization and risk control are achieved.
For the heavy metal polluted soft soil foundation, in addition to the in-situ passivation restoration, foundation treatment is also carried out, and typically, the bearing capacity is improved by using a drainage consolidation method. However, the current environmental remediation and foundation treatment engineering measures are two separate steps, two sets of different treatment equipment are required, and separate remediation time and cost are required, which results in higher cost. Therefore, the method combines the in-situ passivation repair of the heavy metal with the drainage consolidation treatment of the soft foundation, can effectively reduce the content of the heavy metal in the polluted soil, can improve the bearing capacity of the soft foundation, can reduce the treatment and treatment cost, shorten the construction time, improve the construction efficiency, has important significance for realizing the effective treatment and reutilization of the heavy metal polluted soil, and has wide market application prospect.
Disclosure of Invention
The invention aims to provide a method for carrying out in-situ passivation repair and drainage consolidation treatment on a heavy metal polluted soil foundation.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for considering both heavy metal polluted soil foundation restoration and drainage consolidation treatment comprises the following steps:
(1) arranging an operation layer with bearing capacity on the surface of the polluted land base to be treated;
(2) the construction machine walks on the surface of the operation layer, and a sand cushion layer is laid on the operation layer;
(3) the vertical drainage plate is arranged into a foundation soil body to be treated;
(4) the plate heads of the drainage plates are connected with the joint sleeves and then connected to the horizontal drainage pipes, and each two rows of drainage plates are provided with one horizontal drainage pipe;
(5) a heavy metal passivation medicament container and a vacuum pump are arranged on the ground and are respectively connected to a horizontal drain pipe through a conveying main pipe;
(6) releasing a chemical agent, communicating the container to a conveying pipeline of the horizontal drainage pipe, disconnecting a vacuum pump from the conveying pipeline of the horizontal drainage pipe, and infiltrating the chemical agent into the polluted soil foundation along the vertical drainage plate to perform a heavy metal passivation reaction;
(7) after the passivation reaction is finished, disconnecting the conveying pipeline from the container to the horizontal drainage pipe, communicating the vacuum pump to the conveying pipeline of the horizontal drainage pipe, and vacuumizing;
(8) and laying a sealing film, starting a vacuum pump, and reinforcing the foundation.
The construction materials of the operation layer comprise a bamboo frame, a Jingba, a geogrid and geotextile.
The sand cushion layer is composed of fine sand or medium coarse sand.
The vertical drainage plate is a plastic drainage plate with a cross-shaped core plate and an outer wrapping filter membrane.
The joint sleeve is provided with a tubular main body, two ends of the tubular main body are respectively sleeved with the horizontal drain pipe, two sides of the tubular main body are provided with flat side wings with hollow inner cavities, the side wings are sleeved on the drain board head, and the inner cavities of the side wings are communicated with the inner cavity of the tubular main body.
The horizontal drainage pipe is formed by splicing multiple sections of PVC pipes together through multiple joint sleeves.
The heavy metal passivation medicament container has a plurality of containers.
The heavy metal passivation agent is biochar, or lime or organic fertilizer.
The invention provides a method for repairing a heavy metal polluted soil foundation and performing drainage consolidation treatment, which applies the same set of equipment, effectively reduces the content of heavy metal in the polluted soil through a cross process, improves the bearing capacity of a soft soil foundation and synchronously realizes two purposes of heavy metal repair and soft foundation treatment. Compared with the existing two independent processes of heavy metal restoration and soft foundation treatment, the method disclosed by the invention combines the two processes, so that the treatment and treatment cost can be reduced, the construction time is shortened, the construction efficiency is improved, and the method is simple in process, easy to popularize and high in practicability.
In the method, the vertical drainage plate can be driven into a position which is more than ten meters deep in the soil body, so that the heavy metal passivation reagent can deeply repair the deep polluted soil body, and the bottleneck that the conventional heavy metal in-situ passivation technology can only repair the shallow soil body is greatly broken through. After the heavy metal is repaired, the drainage plate can still be continuously applied to a drainage consolidation method for soft foundation treatment, so that the foundation bearing capacity is improved, and the range of subsequent utilization of the field is further expanded.
Drawings
FIG. 1 is a schematic technical section view of a combined treatment of in-situ passivation and remediation with drainage consolidation of a heavy metal contaminated soil foundation.
FIG. 2 is a schematic plan view of the arrangement of horizontal drainage pipes in the sand mat.
Fig. 3a is a schematic plan view of the joint sleeve 5.
Fig. 3b is a schematic cross-sectional view a-a of the joint sleeve 5.
Fig. 3c is a schematic B-B cross-section of the joint sleeve 5.
Wherein: 1-polluted soil foundation, 2-vertical drainage plate, 3-operation layer, 4-sand cushion layer, 5-joint sleeve, 5.1-lateral wing, 5.2-tubular main body, 6-horizontal drainage pipe, 7-medicament container, 8-geomembrane and 9-vacuum pump.
Detailed Description
The invention is implemented according to the following steps:
(1) arranging an operation layer 3 with bearing capacity on the surface of a polluted soil foundation 1 to be treated, firstly laying a layer of woven cloth, and then laying a layer of geogrid, thereby forming the operation layer 3 with certain bearing capacity;
(2) the construction machinery walks on the surface of the operation layer, and a sand cushion layer 4 is laid on the operation layer, wherein the thickness of the sand cushion layer meets the requirements of relevant specifications;
(3) arranging vertical drainage plates 2 on the sand cushion layer 4 at intervals (0.8-1.0 m) to form a square array on a plane;
(4) the plate head of the drainage plate 2 is connected with a joint sleeve 5, the joint sleeve 5 is provided with a tubular main body 5.2 as shown in figures 3 a-3 c, two ends of the tubular main body are respectively sleeved with a horizontal drainage pipe 6, the side wall of the tubular main body is provided with a long and narrow rectangular opening at the opposite position, a side wing with a hollow inner cavity extends from the rectangular opening to two outer sides respectively, and the inner cavity of the side wing is communicated with the inner cavity of the tubular main body. The side wings are sleeved on the plate head of the drainage plate 2. Two side wings of a joint sleeve 5 are respectively connected with the two drainage plates 2, and the sleeve connects the front and rear horizontal drainage pipes 6 together to form the arrangement of a horizontal pipeline 6 in the middle of the two longitudinal drainage plates 2;
(5) on the ground, a vessel 7 and a vacuum pump 9 are provided. A heavy metal passivation agent is arranged in the container 7 and is connected with the horizontal drainage pipe 6 through the conveying main pipe;
(6) the connection passage of the container 7 to the horizontal drain pipe is connected, and the vacuum pump is disconnected from the horizontal drain pipe. Chemical agents are released, and the agents permeate into the polluted soil foundation 1 from the agent container 7 to the horizontal drainage pipe 6 along the vertical drainage plate 2, so that heavy metals are passivated, and the purpose of pollution treatment is achieved;
(7) after the passivation reaction is finished, pulling out a conveying main pipe connected with the reagent container, and connecting the conveying main pipe to a vacuum pump 9;
(8) and laying a sealing film 8, starting a vacuum pump 9, and reinforcing the foundation to enable the foundation to reach a certain bearing capacity.
Claims (7)
1. A method for considering both heavy metal polluted soil foundation restoration and drainage consolidation treatment comprises the following steps:
(1) arranging an operation layer with bearing capacity on the surface of the polluted land base to be treated;
(2) the construction machine walks on the surface of the operation layer, and a sand cushion layer is laid on the operation layer;
(3) the vertical drainage plate is arranged into a foundation soil body to be treated;
(4) the plate heads of the drainage plates are connected with the joint sleeves and then connected to the horizontal drainage pipes, and each two rows of drainage plates are provided with one horizontal drainage pipe;
(5) a heavy metal passivation medicament container and a vacuum pump are arranged on the ground and are respectively connected to a horizontal drain pipe through a conveying main pipe;
(6) releasing a heavy metal passivation medicament, communicating the container with a conveying pipeline of a horizontal drainage pipe, disconnecting a vacuum pump from the conveying pipeline of the horizontal drainage pipe, and allowing the heavy metal passivation medicament to permeate into a polluted soil foundation along a vertical drainage plate to perform heavy metal passivation reaction, wherein the heavy metal passivation medicament is biochar, lime or organic fertilizer;
(7) after the passivation reaction is finished, disconnecting the conveying pipeline from the container to the horizontal drainage pipe, communicating the vacuum pump to the conveying pipeline of the horizontal drainage pipe, and vacuumizing;
(8) and laying a sealing film, starting a vacuum pump, and reinforcing the foundation.
2. The method for repairing the heavy metal polluted soil foundation and performing drainage consolidation treatment at the same time according to claim 1, characterized in that: the construction materials of the operation layer comprise a bamboo frame, a Jingba, a geogrid and geotextile.
3. The method for repairing the heavy metal polluted soil foundation and performing drainage consolidation treatment at the same time according to claim 1, characterized in that: the sand cushion layer is composed of fine sand or medium coarse sand.
4. The method for repairing the heavy metal polluted soil foundation and performing drainage consolidation treatment at the same time according to claim 1, characterized in that: the vertical drainage plate is a plastic drainage plate with a cross-shaped core plate and an outer wrapping filter membrane.
5. The method for repairing the heavy metal polluted soil foundation and performing drainage consolidation treatment at the same time according to claim 1, characterized in that: the joint sleeve is provided with a tubular main body, two ends of the tubular main body are respectively sleeved with the horizontal drain pipe, a long and narrow rectangular opening is formed in the side wall of the tubular main body at the opposite position, the side wing with the hollow inner cavity extends from the rectangular opening to two outer sides respectively, and the inner cavity of the side wing is communicated with the inner cavity of the tubular main body.
6. The method for repairing the heavy metal polluted soil foundation and performing drainage consolidation treatment at the same time according to claim 1, characterized in that: the horizontal drainage pipe is formed by splicing multiple sections of PVC pipes together through multiple joint sleeves.
7. The method for repairing the heavy metal polluted soil foundation and performing drainage consolidation treatment at the same time according to claim 1, characterized in that: the heavy metal passivation medicament container has a plurality of containers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910266430.0A CN110106860B (en) | 2019-04-03 | 2019-04-03 | Method for repairing heavy metal polluted soil foundation and treating drainage consolidation |
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| CN201910266430.0A CN110106860B (en) | 2019-04-03 | 2019-04-03 | Method for repairing heavy metal polluted soil foundation and treating drainage consolidation |
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| CN110106860A CN110106860A (en) | 2019-08-09 |
| CN110106860B true CN110106860B (en) | 2022-04-15 |
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| CN112505291A (en) * | 2020-11-13 | 2021-03-16 | 河海大学 | Test device and method for heavy metal precipitation and solidification of river and lake bottom mud and foundation reinforcement |
| CN116116891B (en) * | 2023-04-10 | 2023-06-30 | 河北大美环境修复科技股份有限公司 | Soil remediation device with even function of dosing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102372406A (en) * | 2011-10-13 | 2012-03-14 | 长沙理工大学 | Heavy-metal-polluted substrate sludge ex-situ repairing method |
| CN102733371A (en) * | 2012-07-18 | 2012-10-17 | 王军 | Closed direct-sucking sectional vacuum preloading foundation treatment method |
| CN105668987A (en) * | 2016-01-14 | 2016-06-15 | 同济大学 | Sludge conditioner and in situ dewatering treatment method by use of sludge conditioner |
| CN105804045A (en) * | 2016-03-29 | 2016-07-27 | 江苏鸿基水利建设工程有限公司 | Equipment for strengthening deep soft soil foundation by vacuum preloading of filter well and method |
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- 2019-04-03 CN CN201910266430.0A patent/CN110106860B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102372406A (en) * | 2011-10-13 | 2012-03-14 | 长沙理工大学 | Heavy-metal-polluted substrate sludge ex-situ repairing method |
| CN102733371A (en) * | 2012-07-18 | 2012-10-17 | 王军 | Closed direct-sucking sectional vacuum preloading foundation treatment method |
| CN105668987A (en) * | 2016-01-14 | 2016-06-15 | 同济大学 | Sludge conditioner and in situ dewatering treatment method by use of sludge conditioner |
| CN105804045A (en) * | 2016-03-29 | 2016-07-27 | 江苏鸿基水利建设工程有限公司 | Equipment for strengthening deep soft soil foundation by vacuum preloading of filter well and method |
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